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/*
Copyright (C) 2007 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <pbd/error.h>
#include <ardour/resampled_source.h>
#include <pbd/failed_constructor.h>
#include "i18n.h"
using namespace ARDOUR;
using namespace PBD;
const uint32_t ResampledImportableSource::blocksize = 16384U;
ResampledImportableSource::ResampledImportableSource (boost::shared_ptr<ImportableSource> src, nframes_t rate, SrcQuality srcq)
: source (src)
{
int err;
source->seek (0);
/* Initialize the sample rate converter. */
int src_type = SRC_LINEAR;
switch (srcq) {
case SrcBest:
src_type = SRC_SINC_BEST_QUALITY;
break;
case SrcGood:
src_type = SRC_SINC_MEDIUM_QUALITY;
break;
case SrcQuick:
src_type = SRC_SINC_FASTEST;
break;
case SrcFast:
src_type = SRC_ZERO_ORDER_HOLD;
break;
case SrcFastest:
src_type = SRC_LINEAR;
break;
}
if ((src_state = src_new (src_type, source->channels(), &err)) == 0) {
error << string_compose(_("Import: src_new() failed : %1"), src_strerror (err)) << endmsg ;
throw failed_constructor ();
}
src_data.end_of_input = 0 ; /* Set this later. */
/* Start with zero to force load in while loop. */
src_data.input_frames = 0 ;
src_data.data_in = input ;
src_data.src_ratio = ((float) rate) / source->samplerate();
input = new float[blocksize];
}
ResampledImportableSource::~ResampledImportableSource ()
{
src_state = src_delete (src_state) ;
delete [] input;
}
nframes_t
ResampledImportableSource::read (Sample* output, nframes_t nframes)
{
int err;
/* If the input buffer is empty, refill it. */
if (src_data.input_frames == 0) {
src_data.input_frames = source->read (input, blocksize);
/* The last read will not be a full buffer, so set end_of_input. */
if ((nframes_t) src_data.input_frames < blocksize) {
src_data.end_of_input = true;
}
src_data.input_frames /= source->channels();
src_data.data_in = input;
}
src_data.data_out = output;
if (!src_data.end_of_input) {
src_data.output_frames = nframes / source->channels();
} else {
src_data.output_frames = src_data.input_frames;
}
if ((err = src_process (src_state, &src_data))) {
error << string_compose(_("Import: %1"), src_strerror (err)) << endmsg ;
return 0 ;
}
/* Terminate if at end */
if (src_data.end_of_input && src_data.output_frames_gen == 0) {
return 0;
}
src_data.data_in += src_data.input_frames_used * source->channels();
src_data.input_frames -= src_data.input_frames_used ;
return src_data.output_frames_gen * source->channels();
}
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